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From e49f2991513ff786625bff7e729ebe9b292e633a Mon Sep 17 00:00:00 2001
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From: Jeffrey Cody <jcody@redhat.com>
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Date: Fri, 19 Sep 2014 03:18:56 +0200
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Subject: [PATCH 17/20] block: add helper function to determine if a BDS is in a chain
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Message-id: <aa9b5aa581c435e579e97bec44bb821e047b59f6.1411096194.git.jcody@redhat.com>
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Patchwork-id: 61310
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O-Subject: [PATCH qemu-kvm-rhev RHEL7.0.z 1/4] block: add helper function to determine if a BDS is in a chain
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Bugzilla: 1122925
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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This is a small helper function, to determine if 'base' is in the
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chain of BlockDriverState 'top'. It returns true if it is in the chain,
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and false otherwise.
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If either argument is NULL, it will also return false.
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Reviewed-by: Benoit Canet <benoit@irqsave.net>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Jeff Cody <jcody@redhat.com>
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Reviewed-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 5a6684d2b957f9ec75d7ed7b14332293abec1d6c)
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Conflicts:
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block.c
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include/block/block.h
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Signed-off-by: Jeff Cody <jcody@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block.c | 11 +++++++++++
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include/block/block.h | 1 +
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2 files changed, 12 insertions(+), 0 deletions(-)
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diff --git a/block.c b/block.c
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index af162fe..7bdbbc6 100644
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--- a/block.c
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+++ b/block.c
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@@ -3439,6 +3439,17 @@ BlockDriverState *bdrv_find(const char *name)
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return NULL;
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}
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+/* If 'base' is in the same chain as 'top', return true. Otherwise,
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+ * return false. If either argument is NULL, return false. */
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+bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base)
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+{
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+ while (top && top != base) {
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+ top = top->backing_hd;
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+ }
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+
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+ return top != NULL;
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+}
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+
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BlockDriverState *bdrv_next(BlockDriverState *bs)
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{
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if (!bs) {
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diff --git a/include/block/block.h b/include/block/block.h
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index 13ef173..972c0e7 100644
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--- a/include/block/block.h
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+++ b/include/block/block.h
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@@ -361,6 +361,7 @@ void bdrv_lock_medium(BlockDriverState *bs, bool locked);
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void bdrv_eject(BlockDriverState *bs, bool eject_flag);
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const char *bdrv_get_format_name(BlockDriverState *bs);
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BlockDriverState *bdrv_find(const char *name);
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+bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base);
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BlockDriverState *bdrv_next(BlockDriverState *bs);
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void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
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void *opaque);
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--
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1.7.1
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